| A | B |
|---|
| what waves do earthquakes release | seismic waves |
| all layers of the earth are arranged by | density |
| convection that occurs in the mantle | mantle convection |
| a theory that the earths surface is composed of several plates that can move over time. | platetecnoic theory |
| the earths surface is broken into many pieces called | plates |
| How many years ago did earth split into many plates about | 3.2 bya |
| How old is the oldest oceanic floor | 225 million years old |
| ages as you travel away from mid ocean ridge. | ocean floor |
| what includes different perspectives on earth? | plate tectonics |
| what waves reveal earth has many layers? | P and S waves |
| do earthquakes occur randomly? | no |
| What percent of earthquakes occur along the ring of fire. | 90% |
| The ring of fire is caused by | the location of earths plate boundaries. |
| What kind of fault is the San Andrea's fault | Transform |
| Do scientists predict there will be a big earthquake soon? | yes |
| Are all the layers of the earth solid | No |
| There are _ continitents | 7 |
| Do all continents drift? | yes |
| What stations relating to graphs are all around the world? | Seismograph stations |
| The inside of the earth is very | hot |
